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L74 vs T67.1

L74 (Eccrine sweat disorders) compared with T67.1 (Heat syncope), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because T67.1 lists L74 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and chapter.L74 is “Eccrine sweat disorders”; T67.1 is “Heat syncope”. L74 sits in L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99); T67.1 in S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88).

Registry fact

Can these codes be reported together?

Yes, when both are documented.T67.1 lists L74 under Excludes2: “sweat disorder due to heat (L74-L75)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. L74 carries 1 Excludes1 note and T67.1 carries 3 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.T67.1’s tabular entry: “sweat disorder due to heat (L74-L75)”. The note covers L74.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

Both are headers.Both are non-billable headers, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

T67.1
Heat syncope
↔
L74
Eccrine sweat disorders

What we found

Yes, when both are documented.T67.1 carries an Excludes2 note covering L74: “sweat disorder due to heat (L74-L75)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2026

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

L74Eccrine sweat disordersT67.1Heat syncope
Billing statusNon-billable header

Report instead: L74.0, L74.1, L74.2, L74.3, L74.4

Non-billable header

Report instead: T67.1XXA, T67.1XXD, T67.1XXS

ClassificationL00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionEccrine sweat disorders is a non-billable ICD-10-CM category code (L74).Heat syncope is a non-billable ICD-10-CM category code (T67.1).
7th character—The appropriate 7th character is to be added to each code from category T67
Includes—
Heat collapse
Excludes1
congenital malformations of integument (Q84.-)
erythema [dermatitis] ab igne (L59.0)
malignant hyperpyrexia due to anesthesia (T88.3)
radiation-related disorders of the skin and subcutaneous tissue (L55-L59)
Excludes2
generalized hyperhidrosis (R61)
burns (T20-T31)
sunburn (L55.-)
sweat disorder due to heat (L74-L75)
Code also—
, if applicable, place of occurrence, such as:
highway rest stop (Y92.523)
school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
service areas as the place of occurrence of the external cause (Y92.52-)
single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
transport vehicle as the place of occurrence of the external cause (Y92.81-)

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

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Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources